Masks or Goggles are safety devices players are required to wear at all times on the field, to protect them from paintballs.
The original equipment used by players were safety goggles of the type used in labs and wood shops; today's goggles are derived from skiing/snowboarding goggles, with an attached hard shell that completely covers the eyes, mouth, ears and nostrils of the wearer.
Masks can also feature throat guards. Modern masks have evolved to be less bulky compared with older designs. Some players may remove the mouth and/or ear protection for aesthetic or comfort reasons, but this is not recommended nor often allowed at commercial venues.